The stock market, after opening higher, reversed course at mid session to close down with prices accelerationg on the downside during the final hour. Systematic models based on prices are again flirting with a sell signal that may attract selling pressure as soon as they turn down. Breadth closed negative: 1018 stocks advanced compared to 2908 that settled down. The cumulative advance/decline line, measuring internal momentum, is again weak and don’t reflect the strtong bounce back of prices since mid March.